Adrian Page 1/5 scale Gee Bee R-2
09-09-2009, 09:29 PM
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Adrian Page 1/5 scale Gee Bee R-2
So I "doinked" my Tiger 2 last weekend, and need to put this electric gear in something.
Well, hanging around my shop, is a framed up AP 1/5 R-2, set up for an OS.91 Surpass. Lately, I don't seem to have much interest in glow, so I thought "why not"? After a few calculations, I find out it's about the same weight as my Tiger 2, so the gear that flew the Tiger would be perfect in this model. Looking to see a rtf weight of about 7.5 lbs, or less. The Tiger was 7 1/4 lbs and flew great with this power. 8-10 minutes of good spirited flight, and only use about 50-65% of my packs. Using a Turnigy SK 42-50-650KV with 5s 5000mah pack. 13x8 APC prop.
The main problem, was where to put the batteries. I needed them way forward, but not enough room on the firewall, due to cowl mounts. Too much hassle to build a hatch in an already framed and sheeted model. So, I cut an opening in the lower firewall, and built a tray to slide them in. Next I needed a mount that was 3" long, so I whipped out some 1/8" ply and fabbed one up. Easy Peasy.
Now, I need to find a way to mount the cowl so battery access will be easy. Already had blind nuts and cowl mounts installed, so I just ran some long screws thru the blind nuts, from the back side. Then put some heatshrink on them to create guides. Next I installed some pushrod tube in the mount holes, for the guides to slide into. Then I installed magnets (1/4" x 1/8") in the cowl and firewall. Holds extremely tight.
Well, hanging around my shop, is a framed up AP 1/5 R-2, set up for an OS.91 Surpass. Lately, I don't seem to have much interest in glow, so I thought "why not"? After a few calculations, I find out it's about the same weight as my Tiger 2, so the gear that flew the Tiger would be perfect in this model. Looking to see a rtf weight of about 7.5 lbs, or less. The Tiger was 7 1/4 lbs and flew great with this power. 8-10 minutes of good spirited flight, and only use about 50-65% of my packs. Using a Turnigy SK 42-50-650KV with 5s 5000mah pack. 13x8 APC prop.
The main problem, was where to put the batteries. I needed them way forward, but not enough room on the firewall, due to cowl mounts. Too much hassle to build a hatch in an already framed and sheeted model. So, I cut an opening in the lower firewall, and built a tray to slide them in. Next I needed a mount that was 3" long, so I whipped out some 1/8" ply and fabbed one up. Easy Peasy.
Now, I need to find a way to mount the cowl so battery access will be easy. Already had blind nuts and cowl mounts installed, so I just ran some long screws thru the blind nuts, from the back side. Then put some heatshrink on them to create guides. Next I installed some pushrod tube in the mount holes, for the guides to slide into. Then I installed magnets (1/4" x 1/8") in the cowl and firewall. Holds extremely tight.
09-09-2009, 09:30 PM
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RE: Adrian Page 1/5 scale Gee Bee R-2
Some more pics. Last pic is the dummy radial. I will cut out the excess between the cylinders and add pushrod tubes, plug wires etc.
I have assembled the model with this set-up, and balance is almost dead-on. I have not mounted the servo tray in the fuse yet, so I can slide it around to get perfect balance.
I have assembled the model with this set-up, and balance is almost dead-on. I have not mounted the servo tray in the fuse yet, so I can slide it around to get perfect balance.
09-16-2009, 09:50 PM
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RE: Adrian Page 1/5 scale Gee Bee R-2
Hey great looking conversion going on there. Happy to see someone besides myself and a few buddys doing the larger electrics. Your dummy engine came looking great. After you paint it that motor will look just the part.
Don another large electric guy
Don another large electric guy
09-17-2009, 08:21 PM
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RE: Adrian Page 1/5 scale Gee Bee R-2
Don,
Glad you like it. I have been messing with smaller electric indoor stuff for a while, but, I just can't get into small models. I recently decided to power a 125" B-17, I have been building, with electric power, so that's what I have been testing power systems for. Now that I have dicovered electric, a lot 40-60 size stuff I have sitting around may get into the air. Like a .40 size twin Comanche, and a .60 Byron V-35 Bonanza. Oh yea, I almost forgot about the 80" T-34C that is nearly ready to put a finish on.
I'm all "ate-up" with stuff. Reminds me of when I first learned to fly. Wanted build everything I saw.
Here's a few pics of the B-17 so far:
Glad you like it. I have been messing with smaller electric indoor stuff for a while, but, I just can't get into small models. I recently decided to power a 125" B-17, I have been building, with electric power, so that's what I have been testing power systems for. Now that I have dicovered electric, a lot 40-60 size stuff I have sitting around may get into the air. Like a .40 size twin Comanche, and a .60 Byron V-35 Bonanza. Oh yea, I almost forgot about the 80" T-34C that is nearly ready to put a finish on.
I'm all "ate-up" with stuff. Reminds me of when I first learned to fly. Wanted build everything I saw.
Here's a few pics of the B-17 so far:
